Bone marrow biopsy and aspiration will be done before receiving SCH 55700 and one month after the injection to evaluate the effects of SCH 55700 on eosinophil production in the bone marrow. For this test, an area of skin and bone is numbed and a very sharp needle is used to withdraw a sample of the bone marrow. Leukapheresis will also be done before and 1 month after SCH 55700 treatment to obtain cells for studying the effect of SCH 55700 on eosinophil activation, function and survival. For this procedure, whole blood is collected through a needle in an arm vein. The blood circulates through a machine that separates it into its components. The white cells are then removed, and the rest of the blood is returned to the body, either through the same needle used to draw the blood or through a second needle placed in the other arm.